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• W2918053460 endingPage "125503" @default.
• W2918053460 startingPage "125503" @default.
• W2918053460 abstract "Having in mind the modelling of marble degradation under chemical pollutants, e.g.~the sulfation process, we consider governing nonlinear diffusion equations and their numerical approximation.The space domain of a computation is the pristine marble object. In order to accurately discretize it while maintaining the simplicity of finite difference discretizations, the domain is described using a level-set technique. A uniform Cartesian grid is laid over a box containing the domain, but the solution is defined and updated only in the grid nodes that lie inside the domain, the level-set being employed to select them and to impose accurately the boundary conditions. We use a Crank-Nicolson scheme in time, while for the space variables the discretization is performed by a standard Finite-Difference scheme for grid points inside the domain and by a ghost-cell technique on the ghost points (by using boundary conditions). The solution of the large nonlinear system is obtained by a Newton-Raphson procedure and a tailored multigrid technique is developed for the inner linear solvers. The numerical results, which are very satisfactory in terms of reconstruction quality and of computational efficiency, are presented and discussed at the end of the paper." @default.
• W2918053460 created "2019-03-02" @default.
• W2918053460 creator A5050725909 @default.
• W2918053460 creator A5053268193 @default.
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• W2918053460 date "2020-12-01" @default.
• W2918053460 modified "2023-09-25" @default.
• W2918053460 title "A level-set multigrid technique for nonlinear diffusion in the numerical simulation of marble degradation under chemical pollutants" @default.
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• W2918053460 doi "https://doi.org/10.1016/j.amc.2020.125503" @default.
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